We identify halos in the N-body, CNN, and COLA outputs using the halo finder code Rockstar [1]}. Rockstar identifies halos using a friend-of-friends algorithm and then determines halo properties by spherical overdensity calculations out to each halo's virial radius. Particles that are not bound to a halo's center of mass are omitted, so the six dimensional phase space of the N-body particle data is utilized by this algorithm. Rockstar provides us with an excellent framework for further assessing the combined, full phase phase predictions of our emulator.
